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http://dx.doi.org/10.5658/WOOD.2012.40.2.123

Evaluation of Secondary Acid and Enzymatic Hydrolysis of Hemicellulose in Hot Water Pre-Pulping Extract of Mixed Hardwoods  

Um, Byung-Hwan (Departmentof Chemical Engineering, Hankyong National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.40, no.2, 2012 , pp. 123-132 More about this Journal
Abstract
Pre-pulping extracts were found to contain a dilute amount of xylo-oligosaccharides and acetic acid as the major components, and many minor components including other organic acids, lignin-derived phenolics, and sugar degradation products. Once separated from the pulp, a secondary hydrolysis step was required to hydrolyze oligomeric hemicellulose sugars into monomeric sugars before fermentation. The following study detailed the extent of hemicellulose recovery by pre-pulping using hot water extraction and characterized the hydrolysis of the extract with respect to comparing acid and enzymatic hydrolysis. The secondaryhydrolysis of hot water extracts made at an H-Factor of 800 was tested for a variety of acid and enzyme loading levels using the sulfuric acid and xylanases. The maximum fermentable sugar yield from acid and enzyme hydrolysis of the extract was 18.7 g/${\ell}$ and 17.7 g/${\ell}$ representing 84.6% and 80.1% of the maximum possible yield, respectively.
Keywords
acid hydrolysis; acetic acid; enzyme hydrolysis; hot water extraction; mixed hardwood; tubular reactor;
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